Should you ever need it, you can possibly open and edit LNG language definitions files using any text editor. As LNG is text files, you could simply rename it to TXT should you wish it, however when renamed the file will no longer be recognized in the original software.
Convert Language definition to Simple text file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert lng to txt on Windows
A free source code and text editor for Windows
Convert from lng file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.